3 devices that need to talk to each other. A computer, a Device, and a monitoring tool. They all use just 1 wire via somthing close to RS232 to communicate (actually Motorolla SCI). Where the device has a 5V pullup and so does my monitoring tool, the computer floats and apparently can also pull high when it wants to communicate. It appears that by default the computer is in listening mode (?)
When I have the computer and either the tool or device plugged in everything works perfectly. My problem is that when I have the device and computer plugged and then plug in the monitoring tool, the devices immediately stops reporting data.
I can only assume this is a hardware conflict since I have not even set the tool to do anything.
My first idea is to maybe take the pullup out of the tool and then it cant only listen, but maybe thats a bad idea ?
Is this a common problem? Or anyway around it ?
When I have the computer and either the tool or device plugged in everything works perfectly. My problem is that when I have the device and computer plugged and then plug in the monitoring tool, the devices immediately stops reporting data.
I can only assume this is a hardware conflict since I have not even set the tool to do anything.
My first idea is to maybe take the pullup out of the tool and then it cant only listen, but maybe thats a bad idea ?
Is this a common problem? Or anyway around it ?